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  1. texfile <- "\\caption[SOME WORDS]"
  2. ## -> \caption[\textit{SOME WORDS}]
  3. texfile <-gsub('\\Q\\caption[\\E\\K([^][]*)]','\\\\textit{\\1}]', texfile, perl=TRUE)
  4. cat(texfile)
Success #stdin #stdout 0.31s 38708KB
comments (?)
stdin 
Standard input is empty
stdout 
\caption[\textit{SOME WORDS}]
https://ideone.com/6RMHIB
language:
R (R 3.5.2)
created:
3 years ago
visibility:
public

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